US5802449A - Broadband communication system and method therefor - Google Patents

Broadband communication system and method therefor Download PDF

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Publication number
US5802449A
US5802449A US08/612,419 US61241996A US5802449A US 5802449 A US5802449 A US 5802449A US 61241996 A US61241996 A US 61241996A US 5802449 A US5802449 A US 5802449A
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Prior art keywords
subscribers
subscriber
center
information
communication system
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Expired - Fee Related
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US08/612,419
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Dieter Beller
Gert Grammel
Gerhard Elze
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Alcatel Lucent NV
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Alcatel NV
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Assigned to ALCATEL N.V. reassignment ALCATEL N.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BELLER, DIETER
Assigned to ALCATEL N.V. reassignment ALCATEL N.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ELZE, GERHARD
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/76—Wired systems
    • H04H20/77—Wired systems using carrier waves
    • H04H20/78—CATV [Community Antenna Television] systems
    • H04H20/79—CATV [Community Antenna Television] systems using downlink of the CATV systems, e.g. audio broadcast via CATV network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H04B10/272—Star-type networks or tree-type networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/76—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet
    • H04H60/78—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by source locations or destination locations
    • H04H60/80—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by source locations or destination locations characterised by transmission among terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/76—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet
    • H04H60/81—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by the transmission system itself
    • H04H60/93—Wired transmission systems
    • H04H60/96—CATV systems
    • H04H60/97—CATV systems using uplink of the CATV systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2801—Broadband local area networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications
    • H04N7/17318—Direct or substantially direct transmission and handling of requests
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/70—Aspects of broadcast communication characterised in that receivers can be addressed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/14—Arrangements for conditional access to broadcast information or to broadcast-related services
    • H04H60/15—Arrangements for conditional access to broadcast information or to broadcast-related services on receiving information

Definitions

  • the invention concerns a broadband communication system for two-way transmission of information between a center and a plurality of subscribers; a method therefor; and a center for the broadband communication system.
  • the broadband communication system is structured as a broadband distribution network.
  • Broadband communication systems as such are known e.g. from the August 1994 brochure "The Telecommunications Engineer", pages 5-10, Heidecker Publishers.
  • a broadband distribution network is described which, in addition to different types of unidirectional TV services, also makes available bidirectional, interactive video services.
  • the subscribers receive television and video signals via a downstream channel, and can request their individual subscriber video signal from the server via a return channel.
  • the broadband distribution network serves to distribute video signals on the one hand, and to communicate between subscriber and server on the other.
  • a disadvantage of the broadband distribution network is that the communication between subscriber and server is limited to the subscribers accepting or refusing offers made by the server.
  • a particular advantage of the invention is the possibility of computer networking via a broadband communication system. Another advantage is the flexibility of adding further subscriber terminals by using a collision monitoring method.
  • One aspect of the invention is a broadband communication system for two-way transmission of information between a center and a plurality of subscribers, wherein groups of subscribers are connected to one broadband network termination each, the broadband network terminations being connected to the center, wherein information is transmittable from the center to the subscribers in a broadband downstream channel, and from the subscribers to the center in a narrow-band return channel, and wherein the information transmitted from one of the subscribers in the return channel is assignable to the plurality of subscribers via a channel in the downstream channel by means of a control facility located at the center, characterized in that each of the broadband network terminations comprises a control unit, and that each of the control units can detect any simultaneous transmission of information from different subscribers of a group, and prevent said information from being forwarded to the center.
  • FIG. 1 is a schematic illustration of a first configuration example of the invention's broadband communication system connected to five subscribers,
  • FIG. 2 is a schematically illustrated construction of a center of the invention's broadband communication system in FIG. 1,
  • FIG. 3 is a schematically illustrated construction of a broadband network termination of the invention's broadband communication system in FIG. 1,
  • FIG. 4 is a power density spectrum
  • FIG. 5 is a schematic illustration of a second configuration example of the invention's broadband communication system connected to two subscribers, and
  • FIG. 6 is a schematically illustrated construction of a broadband network termination of the invention's broadband communication system in FIG. 5.
  • FIG. 1 illustrates a broadband communication system SYS connected to five subscribers.
  • the broadband communication system SYS comprises a center ZE and two broadband network terminations BONT1, BONT2.
  • Each one of the broadband network terminations BONT1, BONT2 is connected with the center ZE through an optical glass fiber line FIBER.
  • the center ZE has more than two optical glass fiber connections for connecting further broadband network terminations BONT.
  • the first broadband network termination BONT1 is connected to four subscribers TN1, TN2, TN3, TN4 via an electric coaxial line KOAX.
  • the second broadband network termination BONT2 is connected to a fifth subscriber TN5 via an electric coaxial line KOAX.
  • the third subscriber TN3 has a television receiver TV, a modem MODEM and a subscriber terminal PC.
  • the television receiver TV is directly connected to the electric coaxial line KOAX;
  • the subscriber terminal PC e.g. a computer PC, is connected to the electric coaxial line via the modem MODEM.
  • the fourth subscriber TN4 has a television receiver TV, which is directly connected to the electric coaxial line KOAX.
  • the fifth subscriber TN5 has a modem MODEM and a subscriber terminal PC.
  • the subscriber terminal PC e.g. a data terminal PC, is connected to the second broadband network termination BONT2 via the modem MODEM and the electric coaxial line KOAX.
  • the center ZE is used to distribute television signals, video signals, radio signals and data signals.
  • Signals transmitted by the center ZE are sent to the broadband network terminations BONT1, BONT2 via optical glass fiber lines FIBER.
  • An electrical conversion takes place in the broadband network terminations BONT1, BONT2.
  • the signals being transmitted by the broadband network terminations BONT1, BONT2 are sent via an electric coaxial line KOAX to one TN5 or several subscribers TN1, TN2, TN3, TN4.
  • the transmission of signals from the center ZE to the subscribers TN1 to TN5 takes place in a downstream channel with a high data rate, in a frequency range of about 50 MHz to 862 MHz.
  • the transmission of signals from subscribers TN1 to TN5 to the center ZE takes place in a return channel with a low data rate, in a frequency range of about 5 MHz to 45 MHz.
  • Each subscriber TN1 to TN5 can basically receive all the signals transmitted by the center ZE. However, many signals are encoded and can only be decoded by authorized subscribers. Subscribers TN1, TN3, TN4 are able to display television and radio signals on their television receiver TV.
  • Specially encoded television and video signals can only be decoded by subscribers TN1 with set-top converters STU and displayed on the television receiver TV.
  • Special video films which are offered by the center ZE in a video film catalog, can be requested by subscriber TN1 through the set-top converter STU.
  • the center ZE sends the requested video film in the form of video signals to all subscribers TN1 to TN5, for the exclusive authorized decoding by subscriber TN1. Only subscriber TN1 is authorized and in a position to decode the requested video signals via the set-top converter STU.
  • Subscribers TN1, TN2, TN3, TN5 have the ability to send and receive information in the form of data signals via the respective modem MODEM.
  • the data signals can e.g. comprise the data of a computer PC or a local network LAN.
  • the respective modem MODEM adds a source address and a destination address to the data being transmitted.
  • the source address is the address of the subscriber TN1, who is transmitting the data.
  • the destination address is the address of the subscriber TN to whom the data are being transmitted.
  • a data signal therefore contains a source address, a destination address and subscriber-specific data.
  • the modem MODEM of a subscriber TN can only process data signals in which the destination address coincides with the address of the subscriber TN. This ensures that data intended for a subscriber TN cannot be received by another subscriber as well.
  • the address of subscriber TN5 is first added as the source address, and the address of subscriber TN1 is added as the destination address.
  • the resulting data signal is modulated by the modem MODEM of subscriber TN5 so that it can be transmitted in the frequency band of the return channel in the broadband communication system SYS.
  • the data signal is then transmitted to the center ZE via the return channel and via the broadband network termination BONT2.
  • the center ZE receives the data signal and, by performing a frequency conversion, processes it so that it can be transmitted in the frequency band of the downstream channel in the broadband communication system SYS.
  • the data signal is then transmitted to all subscribers TN1 to TN5.
  • Subscribers TN1 recognizes the destination address in the data signal as his own, and demodulates the data signal with the modem MODEM. In this way the data from subscriber TN5 are transmitted with his address to subscriber TN1.
  • Subscriber TN1 can then transmit a return message to subscriber TN5, acknowledging the receipt of the data from subscriber TN5. In addition to the source address, this return message contains e.g. an indication of the extent of the received data.
  • FIG. 2 is a schematic illustration of the center in FIG. 1.
  • the center ZE comprises a television and radio server TVS, a video-on-demand server VOD, a service-on-demand server SOD with a control facility CONTROL, and an optical beam splitter SPLIT.
  • the television and radio server TVS and the video-on-demand server VOD are used to distribute radio, television and video signals.
  • the individual signals are superimposed and routed to an optical beam splitter SPLIT, which transmits them to the broadband network terminations BONT and to the subscribers TN.
  • the service-on-demand server SOD is used as a relay station for transmitting data signals from one subscriber to another subscriber.
  • the service-on-demand server SOD receives the data signals from the one subscriber in the return channel of the broadband communication system SYS, processes the data signals in the control facility CONTROL, and by means of the tree structure of the broadband communication system SYS, transmits the data signals via the downstream channel of the broadband communication system SYS to all subscribers connected to the center, thereby also reaching the other subscriber and ensuring the transmission of the data signals.
  • a frequency conversion takes place in the control facility, whereby the data signals are converted from the frequency range of the return channel to the frequency range of the downstream channel.
  • FIG. 3 is a schematic illustration of one of the two equivalent broadband network terminations in FIG. 1.
  • the broadband network termination BONT comprises an optical-electrical converter OE, a control unit UNIT, a band-pass filter for the return channel BPR and a band-pass filter for the downstream channel BPV.
  • the band-pass filters BPR, BPV are e.g. passive electrical filters.
  • the signals transmitted to the broadband network termination BONT by the center ZE are optically-electrically converted by the optical-electrical converter OE and transmitted via the band-pass filter for the downstream channel BPV to the subscribers TN, who are connected to the broadband network termination BONT.
  • the band-pass filter for the downstream channel BPV only lets signals pass, whose frequency is in the frequency range of the downstream channel; the band-pass filter for the downstream channel BPV especially blocks signals whose frequency is in the frequency range of the return channel.
  • the signals transmitted by the subscribers TN to the broadband network termination via the return channel are filtered by the band-pass filter for the return channel BPR and routed to the control unit UNIT.
  • the band-pass filter for the return channel BPR only lets signals pass, whose frequency is in the frequency range of the return channel. Collision monitoring takes place in the control unit UNIT. Since several subscribers are connected to a broadband network termination BONT via a common line KOAX, and all subscribers TN have equal access to the common line KOAX, collisions can occur during the simultaneous transmission of information from different subscribers TN through the common line.
  • the detection of collisions takes place e.g. with a threshold value detector, which sends out an alarm if the amplitude of the monitored signal exceeds a predetermined threshold value. If a collision occurs, the transmission of the collision to the center is blocked, and all subscribers TN connected to the respective broadband network termination BONT receive a return message from the control unit UNIT about the occurrence of a collision, via the downstream channel.
  • the subscribers TN repeat their transmission after a period of time determined by a random generator.
  • the random generator is located in the modem MODEM. If a collision occurs, the signals from the subscribers TN are forwarded by the control unit UNIT to the center ZE.
  • FIG. 4 illustrates a power density spectrum for the signals transmitted by the broadband communication system SYS in FIGS. 1 and 5.
  • the return channel R is located in a low frequency range of about 5 MHz to 45 MHz.
  • a 10 MHz wide channel e.g., the data channel in the return channel PCR, is reserved for the transmission of data signals from the subscribers TN to the center ZE.
  • the downstream channel V is located in a higher frequency range of about 50 MHz to 862 MHz.
  • the downstream channel V comprises a control channel S, a radio channel UKW, a television channel TVK and a video-on-demand channel VODK.
  • Information for the set-top converter STU is transmitted via the control channel S, e.g. to disconnect requested video signals.
  • a 10 MHz wide data channel in the downstream channel PCV is reserved e.g. for transmitting data signals from the center ZE to the subscribers TN.
  • FIG. 5 illustrates a broadband communication system connected to two subscribers.
  • the broadband communication system SYS has a center ZE and two broadband network terminations BONT1, BONT2.
  • the center ZE has a television and radio server TVS for transmitting television and radio signals, a video-on-demand server VOD for transmitting video signals, a service-on-demand server SOD with a control facility CONTROL for transmitting, processing and receiving data signals, and two optical beam splitters SPLIT1, SPLIT2.
  • the television, radio and video signals are transmitted to the broadband network terminations BONT1, BONT2 via the optical beam splitter SPLIT1, and via optical glass fiber lines FIBER.
  • the data signals are transmitted to and from the center ZE, and from and to the broadband network terminations BONT1, BONT2, via the second optical beam splitter SPLIT2.
  • the control and the return channels of the broadband communication system SYS are transmitted via the second optical beam splitter SPLIT2.
  • the subscriber TN2 can receive television, radio and video signals through the set-top converter, then display them on the television receiver, and also request additional special television and video signals from the television and radio server TVS, or from the video-on-demand server VOD, via the return channel of the broadband communication system SYS.
  • the subscriber TN2 can receive and transmit data signals via the modem MODEM.
  • the data signals are first transmitted to the service-on-demand server SOD in the return channel via the broadband network termination BONT2 and the optical beam splitter SPLIT2.
  • the control facility CONTROL in the service-on-demand server SOD converts the data signals from the frequency range of the return channel to the frequency range of the control channel.
  • the data signals are then transmitted to subscriber TN1 by the control channel via the optical beam splitter SPLIT2 and the broadband network termination BONT2.
  • the data signals contain a source address. a destination address and the data to be transmitted.
  • the source address is the address of the subscriber TN from whom data are being transmitted.
  • the destination address is the address of the subscriber TN to whom the data are being transmitted.
  • a modem MODEM of a subscriber TN can only process data signals in which the destination address coincides with the address of the subscriber TN, i.e. each modem MODEM contains a subscriber-specific address. This ensures that data intended for one subscriber TN cannot be received by another subscriber TN as well.
  • FIG. 6 illustrates one of the two equivalent broadband network terminations in FIG. 5.
  • the broadband network termination BONT has two optical-electrical converters OE1, OE2, a control unit UNIT, a band-pass filter for the return channel BPR, and a band-pass filter for the control channel BPS.
  • the band-pass filters BPR, BPS are e.g. passive electrical filters.
  • the television, radio and video signals transmitted from the center ZE to the broadband network termination BONT are converted by the first optical-electrical converter OE1, and routed to the individual subscribers TN via separate, star-connected coaxial lines KOAX.
  • the signals transmitted to the broadband network termination BONT via the control channel are optically-electrically converted by the second optical-electrical converter OE2, and routed through a star-connection to the separate coaxial lines KOAX via the band-pass filter for the control channel BPS, and thereby to the individual subscribers TN.
  • the band-pass filter for the control channel BPS only lets signals pass, whose frequency is within the frequency range of the control channel.
  • the signals transmitted from the subscribers TN to the broadband network termination via the return channel are filtered by the band-pass filter for the return channel BPR, and routed to the control unit UNIT.
  • the band-pass filter for the return channel BPR only lets those signals pass, whose frequency is within the frequency range of the return channel.
  • the control unit UNIT monitors for collisions. Since several subscribers TN are connected to a broadband network termination BONT by a common line KOAX, and all subscribers TN have equal access to the common line KOAX, collisions can take place during simultaneous transmission of information by different subscribers TN via the common line.
  • the collisions are detected e.g. by a threshold value detector, which sends out an alarm if the amplitude of the monitored signal exceeds are predetermined threshold value. If a collision takes place, transmission of the collision to the center is blocked and all subscribers TN connected to the respective broadband network termination BONT receive a return message from the control unit UNIT via the downstream channel, about the occurrence of a collision.
  • the subscribers TN repeat their transmission process after a period of time determined by a random generator.
  • the random generator is located in the modem MODEM. If a collision takes place, the control unit UNIT forwards the signals from the subscribers TN to the center ZE.
  • each broadband communication system SYS has a center ZE.
  • the center ZE can also be subdivided into a main center and several subcenters.
  • a television and radio server TVS can e.g. be located in the main center, which supplies all subscribers TN with television and radio signals.
  • Local video-on-demand servers VOD and/or service-on-demand servers SOD in several subcenters can then e.g. supply video and data signals to a group of subscribers. This has the advantage that several servers are able to react to regionally different subscriber requests.
  • the collision is detected by the control unit UNIT in the broadband network termination.
  • the collision can also be detected by the control facility CONTROL in the center ZE. This has the advantage that standard broadband network terminations can be used.
  • the set-top converters STU and the modems MODEM in the configuration examples are separate units.
  • the function of the modem MODEM can also be incorporated in a set-top converter STU. In addition to saving the cost of a unit and increasing the user-friendliness, this has the further advantage of saving on circuitry, because of the omission of the duality of components, such as of the voltage supply.
  • the configuration examples have no amplifiers, no attenuators, no equalizers, etc. in the centers ZE and broadband network terminations BONT, whose utilization, arrangement, advantages or even necessity are known to the professional, e.g. from "Electrical Information Ways", 3rd. quarter 1993, pages 248 to 259.
  • a broadband communication system SYS can contain e.g. 100 broadband network terminations with 150 subscribers each.
  • the destination address can also address several subscribers, by using a destination address that is valid for a group of subscribers. This would allow contacting a group of subscribers by transmitting a data signal, which could e.g. be advantageous for sending out circulars.
  • the indication of the frequency ranges for the downstream and the return channels, as well as the frequency separation of the two channels, are only examples.
  • the downstream channel can e.g. cover the 0-862 MHz frequency range with the frequency range of 300 MHz to 310 MHz for the transmission of data signals, and the return channel with the frequency range of 5 MHz to 30 MHz.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computing Systems (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Small-Scale Networks (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
US08/612,419 1995-03-09 1996-03-07 Broadband communication system and method therefor Expired - Fee Related US5802449A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19508394.6 1995-03-09
DE19508394A DE19508394A1 (de) 1995-03-09 1995-03-09 Breitbandkommunikationssystem und Verfahren dazu

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US20030154490A1 (en) * 2002-02-08 2003-08-14 Ming-Chih Chang Broadcasting apparatus used in a computer system
EP1379087A1 (de) * 2002-05-20 2004-01-07 K Communication SpA Apparat und Verfahren zur Übertragung und zum Austausch von Informationen über ein Fernsehnetz
KR100440961B1 (ko) * 2001-11-24 2004-07-21 삼성전자주식회사 네트워크를 통한 멀티미디어 프로그램 공급 시스템 및 방법
US6795438B1 (en) * 1998-10-28 2004-09-21 Intel Corporation Method and apparatus for extending point-to-point/asynchronous transfer mode services to client computer systems
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DE19508394A1 (de) 1996-09-12
EP0731619B1 (de) 2004-12-29

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